A Geomatics Approach to Evaluate the Land Erosion and Accretion in Coastal Bangladesh: A Case Study at Kalapara Upazila of Patuakhali District

Abstract

The main objective of the present study is to determine the erosion-accretion rate in the coastal Bangladesh. Multispectral remote sensing sources from Landsat MSS, Landsat TM, Landsat ETM and Landsat OLI, were used to extract the land area. Both Remote Sensing and Geographic Information system were used to extract the land area from satellite imageries to develop a Geomatics approach. The study was conducted in ten years interval from 1978 to 2018. It reveals that accretion rate is about 21.76 hectares/year and erosion in about 32.31 hectares /year which indicates the dynamics nature of coastal area. According to the analysis, about 1156.59 hectares of land was lost between the years 1978 to 2008 but there is an indication of accretion in next ten years as the net gain of land was 312.53 hectares from 2008 to 2018.